Arduino tone generator

This method is to generate a simple square wave tone using Arduino.

Connect the output pin 9 to a buzzer or speaker.

void setup() {
  pinMode(9, OUTPUT);
  tone(9,260);
}
void loop() {
  }

void setup() {
  pinMode(9, OUTPUT);
}
void loop() {
  tone(9,260,500);
  delay(1000);
  }

void setup() {
  pinMode(9, OUTPUT);
}
void loop() {
  tone(9,260);
  delay(500);
  noTone(9);
  delay(500);
  }

Arduino half-hour Beeping Timer

The Arduino beeping timer generates a beep tone with an interval of 30 minutes between each beeping sound. The beep sound has a duration of 3 seconds and a frequency of 1500Hz. Instead of the delay function, the code uses millis() function to obtain the time. So between each tone, additional codes can be added to execute in the 30 minutes time interval.

Beeping Timer code

const int output_pin = 9;
int frequency = 1500, duration = 3000;
unsigned long delays = 0, times=0;

void setup() {
  pinMode(output_pin, OUTPUT);
  /* 30 minutes delay
  30mnts x 60 = 1800 sec
  1800sec = (1800*1000) ms */
  delays = 1800000;
}

void loop() {
  times = millis();
  tone(output_pin, frequency, duration);
  while(millis() < times + delays ){
  // Other codes to run during the 30 minutes.
  }
}